The bus AD 7 – AD 0, also known as the address/data bus, is used by the 8085 microprocessor to transfer data and addresses between the microprocessor and the memory or input/output devices. However, this bus is multiplexed, which means that it carries both the address and the data at the same time.
In order to access the memory or input/output devices, the microprocessor first needs to send the memory address on the address bus. However, since the bus is multiplexed, the microprocessor also needs to send the data on the same bus at the same time. This can cause conflicts and make it difficult for the memory or input/output devices to properly access the instructions or data.
To overcome this issue, the 8085 microprocessor uses a technique called de-multiplexing to separate the address and the data on the bus. De-multiplexing is the process of splitting a multiplexed signal into its individual components. In the case of the 8085 microprocessor, this means that the address and the data are separated on the bus and can be accessed independently by the memory or input/output devices.
De-multiplexing the bus AD 7 – AD 0 is necessary for the 8085 microprocessor to properly access the memory or input/output devices and retrieve the necessary instructions or data. Without de-multiplexing, the microprocessor would not be able to properly communicate with the memory or input/output devices and would not be able to execute its instructions efficiently.
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